Melvin and I have had a chance to look at Luray
and Skyline caverns, both
of which are near the Washington DC area (in fact, they're within 30 minutes
of each other).

These images were taking mostly without the benefit of a flash, as odd as
that might seem. Modern lighting techniques seem to have handled things well
enough for my digital camera to deal with. Still, these images pale compared
to the real thing; I strongly recommend you try to get out to these places for
yourself, if you're in the area.